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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0af780596cbe3264ffc8de360f9b8ec60ebe947f11237bbae77268c48bacf36c' 
  AND token = 'JBrAyvaHo/rN41s4S2zKSLo2/F4kp9IlKKnJuE2M+6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}